Misnomer `closestPointOnLineSegment`

[1j01]

skele2d/source/helpers.coffee

Lines 26 to 33 in 21d3d1a

	export closestPointOnLineSegment = (point, a, b)->
	# https://stackoverflow.com/a/3122532/2624876
	a_to_p = {x: point.x - a.x, y: point.y - a.y}
	a_to_b = {x: b.x - a.x, y: b.y - a.y}
	atb2 = a_to_b.x**2 + a_to_b.y**2
	atp_dot_atb = a_to_p.x*a_to_b.x + a_to_p.y*a_to_b.y
	t = atp_dot_atb / atb2
	return {x: a.x + a_to_b.x*t, y: a.y + a_to_b.y*t}

This function is missing clamping of t to 0-1, thus making it project onto an infinite line, not find the closest point on a line segment.

To be fair, the StackOverflow answer is misleading, it does not answer the asked question.

Anyways, I should fix closestPointOnLineSegment and expose closestPointOnInfiniteLine with the old behavior.